Linux Distros Unpatched Vulnerability : CVE-2023-28756

#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##

include('compat.inc');

if (description)
{
  script_id(226964);
  script_version("1.11");
  script_set_attribute(attribute:"plugin_modification_date", value:"2026/05/21");

  script_cve_id("CVE-2023-28756");

  script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2023-28756");

  script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
  script_set_attribute(attribute:"description", value:
"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied
patch available.

  - A ReDoS issue was discovered in the Time component through 0.2.1 in Ruby through 3.2.1. The Time parser
    mishandles invalid URLs that have specific characters. It causes an increase in execution time for parsing
    strings to Time objects. The fixed versions are 0.1.1 and 0.2.2. (CVE-2023-28756)

Note that Nessus relies on the presence of the package as reported by the vendor.");
  script_set_attribute(attribute:"see_also", value:"https://access.redhat.com/security/cve/cve-2023-28756");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2023-28756");
  script_set_attribute(attribute:"see_also", value:"https://ubuntu.com/security/CVE-2023-28756");
  script_set_attribute(attribute:"solution", value:
"There is no known solution at this time.");
  script_set_attribute(attribute:"agent", value:"unix");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:U/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:U/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2023-28756");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");
  script_set_attribute(attribute:"vendor_unpatched", value:"true");

  script_set_attribute(attribute:"vuln_publication_date", value:"2023/03/30");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/03/05");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:14.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:16.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:18.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:20.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:24.04:-:lts");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.04");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:canonical:ubuntu_linux:25.10");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:7");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:centos:centos:8");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:12.0");
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  script_set_attribute(attribute:"cpe", value:"cpe:/o:redhat:enterprise_linux:8");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:ruby");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-bigdecimal");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-bson");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-bson-doc");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-psych");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-racc");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-rss");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-test-unit");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-typeprof");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygem-xmlrpc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygems");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:centos:centos:rubygems-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:jruby");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:ruby3.1");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-bundled-gems");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-default-gems");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-devel");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-doc");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-libs");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:ruby-tcltk");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygem-abrt-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygem-bigdecimal");
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  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:redhat:enterprise_linux:rubygem-test-unit");
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  script_category(ACT_GATHER_INFO);
  script_family(english:"Misc.");

  script_copyright(english:"This script is Copyright (C) 2025-2026 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("set_linux_os_id.nasl", "ssh_get_info2.nasl");
  script_require_keys("Host/OS/identifier", "Host/cpu", "Host/local_checks_enabled", "global_settings/vendor_unpatched");
  script_require_ports("Host/OS/CentOS Linux-7", "Host/OS/CentOS Linux-8", "Host/OS/Debian Linux-12", "Host/OS/Red Hat Enterprise Linux-7", "Host/OS/Red Hat Enterprise Linux-8", "Host/OS/Ubuntu Linux-14.04", "Host/OS/Ubuntu Linux-16.04", "Host/OS/Ubuntu Linux-18.04", "Host/OS/Ubuntu Linux-20.04", "Host/OS/Ubuntu Linux-24.04", "Host/OS/Ubuntu Linux-25.04", "Host/OS/Ubuntu Linux-25.10");

  exit(0);
}

if (!get_kb_item("global_settings/vendor_unpatched")) exit(0, "Unpatched Vulnerabilities Detection not active.");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (empty_or_null(get_one_kb_item("Host/CentOS/rpm-list")) && empty_or_null(get_one_kb_item("Host/Debian/dpkg-l")) && empty_or_null(get_one_kb_item("Host/RedHat/rpm-list"))) audit(AUDIT_PACKAGE_LIST_MISSING);

include('linux_unpatched.inc');

var distro_constraints_array = {
  "Debian Linux-12": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "12",
        "pkgs": [
          {"reference": "jruby"},
          {"reference": "libruby3.1"},
          {"reference": "ruby3.1"},
          {"reference": "ruby3.1-dev"},
          {"reference": "ruby3.1-doc"}
        ]
      }
    ]
  },
  "Ubuntu Linux-14.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "14.04",
        "pkgs": [
          {"reference": "jruby"}
        ]
      }
    ]
  },
  "Ubuntu Linux-16.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "16.04",
        "pkgs": [
          {"reference": "jruby"}
        ]
      }
    ]
  },
  "Ubuntu Linux-18.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "18.04",
        "pkgs": [
          {"reference": "jruby"}
        ]
      }
    ]
  },
  "Ubuntu Linux-20.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "20.04",
        "pkgs": [
          {"reference": "jruby"}
        ]
      }
    ]
  },
  "Ubuntu Linux-24.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "24.04",
        "pkgs": [
          {"reference": "jruby"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.04": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.04",
        "pkgs": [
          {"reference": "jruby"}
        ]
      }
    ]
  },
  "Ubuntu Linux-25.10": {
    "package_manager": "dpkg-l",
    "constraints": [
      {
        "release": "25.10",
        "pkgs": [
          {"reference": "jruby"}
        ]
      }
    ]
  },
  "CentOS Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "ruby"},
          {"reference": "ruby-devel"},
          {"reference": "ruby-doc"},
          {"reference": "ruby-irb"},
          {"reference": "ruby-libs"},
          {"reference": "ruby-tcltk"},
          {"reference": "rubygem-bigdecimal"},
          {"reference": "rubygem-io-console"},
          {"reference": "rubygem-json"},
          {"reference": "rubygem-minitest"},
          {"reference": "rubygem-psych"},
          {"reference": "rubygem-rake"},
          {"reference": "rubygem-rdoc"},
          {"reference": "rubygems"},
          {"reference": "rubygems-devel"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-7": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "7",
        "pkgs": [
          {"reference": "ruby"},
          {"reference": "ruby-devel"},
          {"reference": "ruby-doc"},
          {"reference": "ruby-irb"},
          {"reference": "ruby-libs"},
          {"reference": "ruby-tcltk"},
          {"reference": "rubygem-bigdecimal"},
          {"reference": "rubygem-io-console"},
          {"reference": "rubygem-json"},
          {"reference": "rubygem-minitest"},
          {"reference": "rubygem-psych"},
          {"reference": "rubygem-rake"},
          {"reference": "rubygem-rdoc"},
          {"reference": "rubygems"},
          {"reference": "rubygems-devel"}
        ]
      }
    ]
  },
  "CentOS Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "ruby"},
          {"reference": "ruby-bundled-gems"},
          {"reference": "ruby-default-gems"},
          {"reference": "ruby-devel"},
          {"reference": "ruby-doc"},
          {"reference": "ruby-irb"},
          {"reference": "ruby-libs"},
          {"reference": "rubygem-abrt"},
          {"reference": "rubygem-abrt-doc"},
          {"reference": "rubygem-bigdecimal"},
          {"reference": "rubygem-bson"},
          {"reference": "rubygem-bson-doc"},
          {"reference": "rubygem-bundler"},
          {"reference": "rubygem-bundler-doc"},
          {"reference": "rubygem-did_you_mean"},
          {"reference": "rubygem-io-console"},
          {"reference": "rubygem-irb"},
          {"reference": "rubygem-json"},
          {"reference": "rubygem-minitest"},
          {"reference": "rubygem-mongo"},
          {"reference": "rubygem-mongo-doc"},
          {"reference": "rubygem-mysql2"},
          {"reference": "rubygem-mysql2-doc"},
          {"reference": "rubygem-net-telnet"},
          {"reference": "rubygem-openssl"},
          {"reference": "rubygem-pg"},
          {"reference": "rubygem-pg-doc"},
          {"reference": "rubygem-power_assert"},
          {"reference": "rubygem-psych"},
          {"reference": "rubygem-racc"},
          {"reference": "rubygem-rake"},
          {"reference": "rubygem-rbs"},
          {"reference": "rubygem-rdoc"},
          {"reference": "rubygem-rexml"},
          {"reference": "rubygem-rss"},
          {"reference": "rubygem-test-unit"},
          {"reference": "rubygem-typeprof"},
          {"reference": "rubygem-xmlrpc"},
          {"reference": "rubygems"},
          {"reference": "rubygems-devel"}
        ]
      }
    ]
  },
  "Red Hat Enterprise Linux-8": {
    "package_manager": "rpm-list",
    "constraints": [
      {
        "release": "8",
        "pkgs": [
          {"reference": "ruby"},
          {"reference": "ruby-bundled-gems"},
          {"reference": "ruby-default-gems"},
          {"reference": "ruby-devel"},
          {"reference": "ruby-doc"},
          {"reference": "ruby-irb"},
          {"reference": "ruby-libs"},
          {"reference": "rubygem-abrt"},
          {"reference": "rubygem-abrt-doc"},
          {"reference": "rubygem-bigdecimal"},
          {"reference": "rubygem-bson"},
          {"reference": "rubygem-bson-doc"},
          {"reference": "rubygem-bundler"},
          {"reference": "rubygem-bundler-doc"},
          {"reference": "rubygem-did_you_mean"},
          {"reference": "rubygem-io-console"},
          {"reference": "rubygem-irb"},
          {"reference": "rubygem-json"},
          {"reference": "rubygem-minitest"},
          {"reference": "rubygem-mongo"},
          {"reference": "rubygem-mongo-doc"},
          {"reference": "rubygem-mysql2"},
          {"reference": "rubygem-mysql2-doc"},
          {"reference": "rubygem-net-telnet"},
          {"reference": "rubygem-openssl"},
          {"reference": "rubygem-pg"},
          {"reference": "rubygem-pg-doc"},
          {"reference": "rubygem-power_assert"},
          {"reference": "rubygem-psych"},
          {"reference": "rubygem-racc"},
          {"reference": "rubygem-rake"},
          {"reference": "rubygem-rbs"},
          {"reference": "rubygem-rdoc"},
          {"reference": "rubygem-rexml"},
          {"reference": "rubygem-rss"},
          {"reference": "rubygem-test-unit"},
          {"reference": "rubygem-typeprof"},
          {"reference": "rubygem-xmlrpc"},
          {"reference": "rubygems"},
          {"reference": "rubygems-devel"}
        ]
      }
    ]
  }
};

var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);

if (!empty_or_null(report))
{
  security_report_v4(
      port       : 0,
      severity   : SECURITY_WARNING,
      extra      : report
  );
  exit(0);
}
else
{
  audit(AUDIT_HOST_NOT, 'affected');
}